/Engine/Plugins/Enterprise/DatasmithImporter/Source/DatasmithImporter/Public/ObjectElements/DatasmithUObjectElements.h
Get the Bounding Box of the Actor as a Vector. X is Width, Y is Height, Z is Depth. The value will are taken from the MeshElement and are factored by the Actor Scale. Bounding Box size can only be calculated if the Mesh can be found.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Datasmith | Element") FVector GetBoundingBoxSize() const